At K2Strong, we teach people life skills to overcome the impossible. We will provide you with knowledge, passion, and strength to live to your full potential and prosper.


In this ever-changing, unpredictable world, we cannot control what happens to us, but we can control how we respond. K2STRONG will give you the knowledge, skills, and strength to master your own destiny.

We offer three custom programs – Fitness, Self-Defense, and Scenario Based Training – that teach sustainable life skills to empower you to live healthy, fit, and secure lives.


“When climbing the Himalayan Mountains to Mount Everest Base Camp you can do all you can to prepare but the mountains and altitude are unforgiving. It’s you against Mother Nature and you have to keep going, one step at a time. There were times when I truly thought I needed to turn back but I kept saying to myself “mind over matter” and took one step and then another. Every day, 5 to 6 helicopters would rescue extremely fit people off the mountains. From day 3 to day 8, I mostly looked down at my boots and was hyper focused on completing just a few more feet. In reflection, training was so important, this trek was no doubt the hardest thing physically and mentally I have ever done. 

The training and fitness routines I received at K2Strong not only helped me physically but helped me develop the mental toughness and endurance needed to complete my goal in reaching Everest Base Camp and beyond. So after 14 days with temperatures ranging from 68 to -31 degrees F, 84 miles of hiking and climbing to an elevation of 18,600 feet, Thank You…K2Strong and here is your flag flying at the top of the world. Btw, your flag is permanently affixed to the top of Mount Kala Patthar at 18,519 feet. Hope that fellow K2Stronger’s someday can make the trek to see the flag.”
– Chris L.

“I am a thirteen year Law Enforcement Veteran. Three years ago I began taking KFX and Krav Maga with Marc Delnicki. I chose to train not only to get into shape, but also to learn how to protect myself, my partners, as well as the public I serve. On several occasions I have had to use the skills Krav Maga has given to me. One incident that comes to mind was the disarming of a knife wielding assailant. Knowing Krav Maga and being confident in what I was taught, I was able to disarm an active knife assault, bring the subject to the ground and subdue him very quickly and safely. No other force was needed, no one was injured beyond the initial victim. In a split second I was able to disarm, detain, and contain a very dangerous fluid situation. Without the knowledge from Krav Maga., the incident could have taken my life, others life and the life of the assailant. My life and the life of others depend on what I have learned.”
– Joel R.

“Prior to joining KFX 3 years ago, regular group exercise classes never seemed to “fit”.  Too difficult, too competitive, boring.  Since I began with KFX, and have been participating in circuit classes 2-3 times per week, I look forward to every class. Marc, the instructor, is an energetic, positive, and knowledgeable presence during every workout. He modifies exercises to meet any challenges I may have on a particular day, and manages to build a sense of community in the classes without a single “ice breaker.” I now have more strength, flexibility, and energy than I could have imagined at my ripe age of 53 and a great community of workout besties (ages 16-60+) who motivate each other to achieve our individual goals!
– Robin S.

“Krav Maga has helped me build upon my previous law enforcement training using instruction in high stress, real life scenarios. Krav Maga is especially important for women who may encounter assailants who are more powerful or armed with a weapon. It empowers women to defend themselves against armed and unarmed attackers. KFX prepared me to return to ice hockey and Police work after injury at the level necessary to be strong and effective. I was able to rebuild strength and increase agility while training at a high level. KFX is an unique program for anyone who wants to increase their fitness level. New and elite athletes train together, modifying each exercise to challenge themselves and reach their personal best. Marc’s knowledge and dedication allows athletes to push themselves during each workout to achieve their fitness goals in a fun group environment.” – Abby D.

“I never thought my wife Jill would ever be anything close to a “gym rat”, but 3 years ago based on an invite from our son, here we both are … 3X/week regulars! At age 62, we can say we are stronger in both strength and endurance. Jill has not had to go to therapy for her chronic shoulder and lower back pains. The routines are always changing (not boring) and challenging to the levels you personally set for yourself. Great way to relieve the stress of the day. We have met great friends at all age levels and walks of life. Did not expect anything like this at the start.”
– John B.

“My time at K2STRONG has provided me with the foundation I need to live the healthiest life possible and be the best person I can be.  I’ve been involved for over three years and I couldn’t imagine what my life would be like without it; the lessons I’ve learned here will always stay with me and continue to guide me.  It’s an amazing program and community, you truly feel like you’re a part of something special, from the workouts and skills learned in the self-defense classes to the people and friendships formed.”
– Chase C.

“When I first started this class it was for Krav Maga. First class I learned how to disarm someone with a knife. Then I saw the fitness class…. I soon transitioned to that class as well. It changed my life. Since I began the fitness class, I have lost 70 lbs.! I cannot give Marc and Russ enough praise. Total life changer !!!”
-Rhonda K.


Russell Lee
Owner and President

Russ is coming out of the technology industry as a sales executive with over 34 years of experience in global competitive sales strategy and transformation. He has always had a passion for martial arts and fitness. Russ has been a lifelong student of multiple martial art disciplines: Judo, Shotokan Karate, Taekwondo, Fu Jow Pai Kung Fu, and Krav Maga. Now as a fitness entrepreneur, he applies the same disciplines of leadership, strategic thinking and outcome-oriented execution from his previous experiences to his vision for the next level of fitness and self-defense. “Our goal is to teach people the life skills to overcome what they once thought was impossible. Give them the knowledge, passion, and strength to live to their full potential and prosper safely in an ever-changing unpredictable world.”

Marc Delnicki
Chief Instructor

Marc is a former US ARMY Ranger with Special Operations Training (SOT) in Winter/Jungle/Amphibious Counter-Terrorism warfare. He has over 20 years of experience in the fitness industry, both as a gym owner and professional trainer (NASM/NFPT Certified). He owned and operated World Gym in Saratoga Springs, NY in 2000 and since then has owned additional successful personal training and self-defense businesses. Marc has an extensive martial arts background in Krav Maga, Boxing, Jiu-Jitsu and MMA. As a US ARMY Ranger with his discipline, mental toughness, creativity and personal courage he “Led the Way”. He continues to “Lead the Way” in the fitness industry with a transformative systematic approach to help people to achieve lifelong sustainable fitness for the ultimate in Health and Wellness.

Achieve Your Fitness and Self Defense Goals

Flexible membership options to suit your level of training and individual fitness and self defense goals